EP1246670A2

EP1246670A2 - Shaped body for production of sports equipment and method for production of said shaped body

Info

Publication number: EP1246670A2
Application number: EP00987463A
Authority: EP
Inventors: Roland Sommer
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-27
Filing date: 2000-12-27
Publication date: 2002-10-09
Anticipated expiration: 2020-12-27
Also published as: WO2001047605A2; US20030104152A1; ES2298169T3; US20100160094A1; CA2415247A1; EP1246670B8; AU2370001A; US8092882B2; EP1246670B1; DE19963241A1; DE50014819D1; WO2001047605A3; DE19963241B4

Abstract

The invention relates to a shaped body (2), for production of sports equipment, in particular tennis, squash, and badminton rackets, golf clubs, hockey and ice hockey sticks and baseball bats, comprising two tubular resonant bodies (4, 6), running parallel to and at a separation from each other, surrounded by a common shell (12) and a spacer body (8), which is arranged between the resonance bodies (4, 6), in such a way that the resonance bodies (4, 6) are coupled, whereby the mass relationship between each resonance body (4, 6) and the spacer body (8) is greater than 1. The vibrations of the two vibrating systems, in the form of the resonance bodies (4, 6), are overlaid in a advantageous manner, by means of the coupling of the resonance bodies (4, 6). The invention further relates to a method for the production of the shaped body (2).

Description

Profile body for the production of sports equipment and method for producing the profile body

The invention relates to a profile body for the production of sports equipment, in particular sports rackets such as tennis, squash, badminton, golf, hockey, ice hockey and baseball bats, and a method for producing the profile body.

In ball sports, for the exercise of which a racket is required, it is known that considerable shock impulses and resonance-related vibrations occur in response to the collision between the racket and the ball. The pronounced vibrations represent a great health risk for the player's shoulder, shoulder and spine. B. the so-called tennis arm is known, in which there is a strong increase in the local tissue metabolism and the leukocyte migration in the tissue due to the vibration behavior of the racket. The tennis arm can be observed very frequently and causes severe pain to the tennis player.

The conventional sports rackets tend to have a disadvantageous vibration behavior after impact with the ball, which generates particularly high energy impulses. The known tennis rackets are designed such that there is a maximum of Nm in the area of the handle and thus in the area of the player's hand.

The German utility model DE 29805032 Ul describes a racket frame for a tennis, badminton or squash racket. The known frame is formed from a single tubular fiber-reinforced plastic. The tubular plastic part has an elliptical cross section, the long sides of which are connected to one or two cross struts are, which form chambers within the individual plastic part. With two webs, a middle chamber is formed that receives a foamed body. Due to the elliptical design of the cross section, the plastic part has the greatest width in its central region, through which the strings of the covering are guided through bores, as a result of which the greatest mass concentration occurs in the central part.

From the American patent US 5,516,100 a frame for a racket is also known which is bent from a single tubular profile element which has a bean-shaped cross section. A reinforcing rib is provided in the individual professional element and connects the two long sides of the bean-shaped cross section. A string guide strip is embedded in the reinforcing rib, which provides sleeves for guiding the strings through the string.

AT 388 106 describes a frame for ball racquets which is made up of a central strip and hollow profiles formed on both sides of the central strip. The median strip consists of a thermoplastic, thermoset, elastomer, rubber, ceramic, wood, metal or similar.

US 4,357,013 describes a structure for a tennis racket frame which is constructed from two outer bodies with a honeycomb structure and an intermediate core. The two bodies and the core are enclosed by a common shell. The core is formed by a spiral rolled and coated plastic sheet.

The above-described frame constructions according to the prior art lead to a disadvantageous vibration behavior of the racket when the ball collides with the covering or the frame itself, the vibration behavior leading to physical damage, such as, for. B. the tennis elbow leads. The present invention is therefore based on the object of creating a profile body for producing a sports device, in particular sports rackets such as tennis, squash, badminton, golf, hockey, ice hockey and baseball bats, which has a favorable vibration behavior and therefore does not Represents health risk for the player without increasing the overall mass of the sports equipment and reducing its strength. In addition, the task is to specify a method that enables the production of such a profile body.

The objects of the invention are achieved with the features of independent claims 1 and 13, respectively. Advantageous developments of the invention are the subject of the dependent claims.

The profile body according to the invention for the production of a sports device has two parallel tubular resonance bodies. The resonance bodies can have any cross section and are arranged at a distance from one another. Both resonance bodies are enclosed by a common shell, a spacer body being arranged between the resonance bodies in such a way that they are coupled. The compressive strength of the spacer body is different in different directions, the compressive strength being greatest in the direction of an axis connecting the centers of the resonance bodies. The direction of the greatest compressive strength thus runs transversely to the longitudinal axis of the resonance bodies, the direction pointing in each case to the resonance bodies. The spacer body thus creates a coupling between two oscillatory systems, each of which is formed by a resonance body, and is likewise enclosed by the common shell. Each of the two resonance bodies has a mass that is greater than the mass of the spacer.

In contrast to the prior art, the inventive resonance body has two tubular resonance bodies, each of which provides an oscillatory system, the two oscillatory systems via one Spacers are coupled, the compressive strength of which is greatest in the direction of an axis connecting the centers of the resonance bodies. The coupling of the two resonance bodies, the individual mass of which is in each case greater than the mass of the distance body, by means of this distance body has the effect that the vibrations of the individual resonance bodies advantageously overlap. So z. B. in a tennis racket that was made from the Profilköφer invention, the maximum amplitude after the impact of the ball no longer in the area of the handle and thus not in the area of the hand of the player. In this way, the arm of the player is relieved and the risk of the formation of a tennis arm is eliminated. The displacement of the mass achieved by the profile body according to the invention from the central area of the spacer body into the outer resonance body also results in better bending behavior of the profile body about its longitudinal axis, since the externally highly loaded tensile / pressure area is enlarged.

In addition, a greater compressive strength of the spacer body transverse to the longitudinal axis is necessary in order to maintain the distance between the resonance bodies even under extreme conditions, such as, for. B. occur during the pressing process. In the latter case, this great dimensional stability is very important because the distance body has to withstand the internal pressure in the two resonance bodies. Perpendicular to the axis that connects the centers of the resonance body, the spacer body is preferably partially elastically deformable, making it possible, on the one hand, to adapt to the profile body contour during the mechanical pressing process, and on the other hand creating the necessary internal pressure.

For example, a tennis racket with a low weight that is less than 290 g can be produced from the profiled body according to the invention. In addition, the resonance frequency of this ready-to-play racket is greater than 170Hz and the rigidity is at least RA 70. In an advantageous embodiment of the profiled body according to the invention, the spacer body consists of wood or a wood-like material, ie a material with a preferred direction. The resonance body can also consist of plywood or multilayer or laminated wood with a preferred direction, but also of pressed wood.

In a particularly advantageous embodiment of the profile body according to the invention, the spacer body consists of balsa wood. In the case of balsa wood, the spacer body is arranged in such a way that the fibers of the balsa wood run parallel to the axis that connects the centers of the resonance bodies. The balsa wood fulfills the above. Requirements for the distance body, which at the same time has a low density and the distance body thus has a low weight. In addition, a plastic filling can be dispensed with, thus making a contribution to environmental friendliness in sports racket construction. If a laminated wood is used, its preferred direction runs parallel to the axis that connects the centers of the resonance bodies.

There are other types of wood, such as cork, which are suitable as a material for the distance body. In addition, other materials, such as. B. honeycomb, wave or tubular materials made of aluminum, paper and certain high temperature resistant plastics.

In an advantageous embodiment of the profile body according to the invention, the width of the resonance body is greater than the width of the distance body, so that the profile body tapers in the region of the distance body. The distance body is only designed such that the forces are absorbed by the covering and the resonance body is coupled.

In a further advantageous embodiment of the profile body according to the invention, the shell has a greater wall thickness on the side of the resonance body that faces away from the opposite resonance body. With such a design of the shell, a large part of the mass of the profile body is arranged in the region of the resonance body and thus no longer in the center of the profile body. The greater wall thickness results in greater resistance to bending around the longitudinal axis of the profile body.

In a further embodiment of the profile body according to the invention, the shell is advantageously formed in one or more layers from a plurality of plastic-impregnated surface materials, the shell on the side of the resonance body, which faces away from the opposite resonance body, each having a first section with a plurality of surface materials lying one above the other. The first sections are connected via two second sections, the surface materials of the first sections overlapping with the surface materials of the second sections in the transition region. The fabrics of the first section are thicker and / or more than the fabrics of the second section, so that more mass is arranged in the area of the resonance body.

In a further advantageous embodiment of the invention, the plastic-impregnated sheet material consists of GRP, AFK, CFK, KFK, MFK fiber plastic with a resin matrix or other layers, fabrics or foils made of metal or plastic that can absorb external forces.

In a further advantageous embodiment of the invention, at least one mass band with chambers is arranged on the wall of at least one resonance body, in which freely movable mass particles or liquid drops are contained, which dampen vibrations and intercept the recoil of a sports racket. A tennis racket made from the profile body according to the invention has a frame and a handle, both being formed by a profile body, so that there is a mass band in the frame and / or the handle. Thus, the damping effect of the mass band can also be used in the area of the handle.

The method according to the invention for producing a profiled body comprises the steps of arranging two tubular resonance bodies with the interposition of a spacer body, the spacer body being oriented such that the direction of the highest compressive strength of the spacer body runs parallel to an axis connecting the centers of the resonance body, applying plastic-impregnated surface materials , which only partially surround the resonance body and the spacer body, each individual surface material being arranged to overlap with another surface material only in the region of the side of the resonance body that faces away from the opposite resonance body, inserting it into a mold under the action of heat, generating a mechanical pressure in the resonance bodies and lateral deformation of the spacer body by means of a slide arranged in the mold and curing in the mold. Since the plastic-impregnated surface materials do not completely enclose the resonance body and the spacer body, the shell is composed of several strip-shaped surface materials, the strips overlapping. In this way, flat materials with different thicknesses can be used at different points on the casing, so that the mass distribution over the casing can be graded very precisely. So it is possible to use thicker materials or more materials than on the other sides on the side of the resonance body facing away from the opposite resonance body, so that the mass is greater there. This is not possible with the methods according to the prior art, since the surface material is applied as a web in the winding method, so that a gradation of the wall thickness cannot be achieved.

In a particularly advantageous embodiment of the method according to the invention, after the lateral deformation of the spacer body and before or during the hardening, the spacer body becomes selectively laterally pierce, the fibers of the sheath being displaced and not destroyed. The resulting continuous recesses serve to accommodate the strings of the covering. Because the fibers of the casing are not destroyed, as is the case in the prior art methods by drilling after curing, the strength is largely retained in this area.

In further preferred embodiments of the method according to the invention, the shell and the spacer body are pierced in the form by means of a dome from one side or two domes are pushed through the shell into the spacer body from opposite sides until their end faces touch in the spacer body. The resulting recesses serve z. B. the inclusion of the strings of a covering.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the attached figures.

Show it:

1 shows a perspective illustration of the profile body according to the invention in a simple first embodiment, FIG. 1 a shows the functional principle of the profile body according to the invention using the example of the first simple embodiment from FIG. 1, FIG. 2 shows the cross-sectional area of the profile body according to the invention in a second embodiment, FIG. 3 a representation of the inventive method in a first

Embodiment, Fig. 4 is an illustration of the inventive method in a second

Embodiment, Fig. 5 is an illustration of the inventive method in a third

Embodiment, Fig. 6 is a representation of the amplitude curve over the length of a

Tennis racket with a frame according to the prior art and with a frame made from the profile body according to the invention,

Fig. 7 shows the frequency spectrum of a tennis racket with covering after

State of the art, FIG. 8 shows the frequency spectrum of the tennis racket according to the invention

Covering with weak excitation, Fig. 9, the frequency spectrum of the tennis racket according to the invention without

Covering with strong excitation, Fig. 10, the resonance spectrum of only one resonance body according to the state of the

Technology and Fig. 11 shows the resonance spectrum of two coupled resonance body according to the

Invention.

Fig. 1 shows a perspective view of the Profilköφers invention in a simple first embodiment. The Profilköφer 2 has two tubular Resonanzköφer 4,6, which are arranged parallel and at a distance from each other. Between the resonance bodies 4.6, a spacer body 8 adjoining the resonance bodies 4.6 is provided, which couples the two vibratory systems in the form of the resonance bodies 4.6. The distance body 8 extends between the resonance bodies 4.6 over the entire length of the profile body 2 and has a width A that is smaller than a width B ,, B _{2 of} the resonance bodies 4.6, so that the mass ratio also results from the dimensioning between each resonance body 4.6 and the distance body 8 is greater than 1. In addition, the Spacer 8 consists of balsa wood, which has only a low density. The distance body 8 has its greatest compressive strength in the direction of an axis 10 connecting the centers of the two resonance bodies, so that the fibers of the balsa wood are arranged in the direction of the axis 10. The two resonance bodies 4, 6 and the spacer body 8 arranged between them are surrounded by a common shell 12. The Profilköφer 2 has over its entire length in the area of the Spacer 8 each through recesses 14 which follow each other at certain intervals. The recesses 14 extend transversely to Axis 10 through the Spacer 8 and through the areas of the sheath 12 laterally surrounding the Spacer 8. The recesses 14 serve to accommodate strings (not shown) of a covering if the Profilköφer 2 is to be used to produce a tennis racket frame.

FIG. 1 a shows the functional principle of the profile body according to the invention using the example of the first embodiment from FIG. 1. In FIG. 1 a, two side views of the profile body from FIG. 1 are shown without a cover. If the profile body shown in FIG. 1 a is deflected or bent in the direction of arrow C, tensile stresses occur in the upper resonance body 6 due to the coupling of the two resonance bodies 4, 6 by the spacer body 8 and 8 compressive stresses in the lower resonance body. If the load is lifted in the direction of arrow C, the profiled body swings back from the deflection and gets into the state shown in FIG. 1 a below, in which the previously stressed resonant body 6 is compressed and the previously pressure-loaded resonant body 4 is stretched. These states alternate in the course of the vibration. The Spacer 8 acts as a neutral fiber, so that it is largely free of bending tensile and compressive stresses. Thus, the distance body 8 is only pressurized in the direction of the axis 10 shown in FIG. 1 in order to transmit the deflection of one resonance body 4.6 to the other resonance body 6.4. By coupling the resonance bodies 4, 6, their resonance frequencies are superimposed and a resulting main frequency arises, which, however, does not represent a resonance frequency. In the event that the resonance bodies are not coupled to one another, they vibrate with a certain resonance frequency similar to a tensioned string. The coupling of the resonance bodies causes the vibrations of one body to influence the vibrations of the other body in such a way that phase shifts and thus the effects mentioned occur. The resonance body together with the distance body represent a strongly damped system, the damping being dependent on the material properties. Fig. 2 shows the cross-sectional area of the Profilköφers invention in a second embodiment. The Profilköφer 16 has two tubular Resonanzköφer 18,20, which are arranged parallel and at a distance from each other. Between the resonance bodies 18, 20 there is an adjacent spacer body 22, which consists of balsa wood, the fibers of which extend parallel to an axis 24 connecting the centers of the resonance bodies 18, 20, so that the direction of the greatest compressive strength of the spacer body 22 points to the resonance bodies , As in the first embodiment, the distance body 22 has a smaller width than each individual resonance body 18, 10, so that the cross section of the profile body 16 tapers in the middle. The mass of each individual resonance body 18, 20 is greater than the mass of the distance body 22.

The resonance bodies 18, 20 are flat on their mutually facing sides 18 ', 20', so that the spacer body 22 comes to bear evenly. The sides 18 ", 20" of the resonance body 18, 20 facing away from the respectively opposite resonance body are curved outwards and narrower than the sides 18 ', 20', so that the cross section of the resonance body 8, 20 tapers outwards from the spacer body 22.

The two resonance bodies 18, 20 and the spacer body 22 arranged between them are surrounded by a common shell 26. The sleeve 26 is composed of two first sections 26 ^' and two second sections 26 ". The first sections 26' are each arranged on the sides 18", 20 "of the resonance body 18, 20, which face away from the opposite resonance body 20, 18 , and are composed of multilayered plastic-impregnated sheet materials 30. The second sections 26 ″ run essentially in the direction of the axis 24 and connect the first sections 26 ′ to one another. The second sections 26 "are also composed of multilayered plastic-impregnated sheet materials 28, the sheet materials 30 of the first sections 26 'being thicker. In addition, more sheet materials are provided in the first sections 26' that the greater part of the mass is shifted to the sides 18 ", 20" of the resonance body 18, 20 facing away from one another and the wall thickness of the casing 26 is made stronger in this area. In transition regions 32, in which the first sections are connected to the second sections 26 ′, 26 ″, the individual sheet materials 30 of the first sections 26 ^′ are arranged to overlap with the sheet materials 28 of the second sections 26 ″. Furthermore, the cross section of the profile body 16 is tapered in the direction of a transverse axis 34 in the region of the spacer body 22 by compressing the same on one side.

A mass carrier band 36 is arranged on the wall of both resonance bodies 18, 20. The mass carrier tapes 36 have individual chambers 38, in which freely movable mass particles 40 are received, which dampen vibrations and intercept the recoil of a sports racket.

The advantages of the profiled body according to the invention from FIGS. 1 and 2 will be discussed later with reference to FIGS. 6 to 11.

3 shows a representation of the method according to the invention in a first embodiment. First, the two resonance bodies 18, 20 are arranged parallel with the interposition of the distance body 22, the distance body 22 being oriented such that the direction of the highest compressive strength of the 22 runs parallel to the axis 24 connecting the centers of the resonance bodies 18, 20. In the case of a spacer body 22 made of balsa wood, the fibers of the balsa wood point in the direction of the adjacent resonance body 18, 20. Subsequently, plastic-impregnated sheet materials are applied which only partially surround the resonance body 18, 20 and the spacer body 22 and overlap only in the region of the sides 18 ", 20" of the resonance body 18, 20 (FIG. 2). The blank is then introduced into a mold 42 consisting of two mold halves 44, 46, this mold being heated. Then a mechanical pressure is generated within the resonance body 18, 20, which expands the resonance body 18, 20 and presses the surface materials forming the envelope against the wall of the mold halves 44, 46. Such an internal pressure can be, for example, about Pressure hoses are generated in the resonance bodies 18, 20. Because of the high compressive strength of the spacer body 22 in the direction of the axis 24, the pressure is unable to compress the spacer body 22 significantly. At the same time, the distance body 22 is pressed in laterally via a slide 48 arranged in the mold half 46, so that the profile body is tapered in the middle. The distance body 22 is thereby partially deformed laterally, but also provides the necessary back pressure that is necessary during pressing. The shaped body shaped in this way then hardens in the mold.

4 and 5 show a representation of the method according to the invention in a second and third embodiment. Both methods have in common that the sheath and the Spacer 22 after the lateral deformation by the slider 48 and before or during curing are punctually punctured laterally to create a continuous recess for the strings of a string without the strength in this area to belittle too much. The puncturing takes place by means of a dome which is designed in such a way that the fibers of the casing are displaced and are not destroyed.

In the second embodiment of the method according to the invention (FIG. 4), a displaceable dome 50 is arranged inside the slider 48, which pierces the casing and the spacer body 22 of the profiled body 16 from one side. In the third embodiment of the method according to the invention (FIG. 5), on the one hand, the displaceable dome 50 and, on the other hand, an opposite dome 52, which is arranged coaxially in the mold half 44, is pushed through the casing and into the spacer body 22 until the end faces of the domes 50, 52 touch in the distance body 22.

Fig. 6 shows a representation of the amplitude curve over the length of a tennis racket with a frame according to the prior art and with a frame from the profiled body according to the invention. The frame according to the prior art consists of a single tubular part, for the reinforcement of which, if necessary, internal ribs have been used. In addition, the Mass of the frame essentially in the area of the center of its cross section. The profile body according to the invention is shown in FIG. 2, the essential difference being that according to the invention two resonance bodies are provided instead of just one resonance body, the two resonance bodies being coupled to one another. In addition, according to the invention, the mass does not concentrate in the middle of the cross section. The amplitude profile 54 in the known racket has five amplitude maxima 56, 58, 60, 62, 64 over the length of the racket, the amplitude maxima 62 and 64 being arranged in the region of the racket grip. Thus, the hand and arm of the player is exposed to a large vibration amplitude, which on the one hand complicates the handling of the racket and on the other hand leads to the health problems described above, such as. B. the tennis elbow. In contrast, the amplitude profile 66 in a racket with a frame made from the profile body according to the invention only has three amplitude maxima 68, 70, 72, the amplitude profile 66 in the region of the racket handle showing that the handle on the racket according to the invention vibrates with a comparatively low amplitude. This makes handling easier and there is also less health risk.

Fig. 7 shows the frequency spectrum of a conventional tennis racket with stringing, which according to the prior art has only a resonance body as a frame. The known racket shows a pronounced resonance frequency 74 and the harmonics 76, 78, 80 which are usual for a frame with only one resonance body. The frequency 82 of the vibrating string can also be seen.

Fig. 8 shows the frequency spectrum of the tennis racket according to the invention with covering with weak excitation, ie the excitation was carried out with little force (bending). The frequency spectrum also has a pronounced measurable resulting main frequency 84, which in this case, however, is the differential mixed product between the lowest resonance frequencies 86, 88 and the top resonance frequencies 90.92 of the two resonance bodies. The fundamental wave therefore has a greater frequency than the fundamental wave in a conventional racket. The distance between the lowest and the highest resonance frequency 86.92 to the measurable resulting main frequency 84 is small (slight deflection). The oscillation frequency 94 of the string can also be seen.

FIG. 9 shows the frequency spectrum of the tennis racket according to the invention without covering with strong excitation, which essentially corresponds to the frequency spectrum of FIG. 8. The distance between the lowermost and uppermost resonance frequencies 86.92 to the measurable resulting main frequency 84 is, however, greater (greater deflection). In addition, the oscillation frequency 94 of the string is missing since the racket is not covered, the entire frequency spectrum being significantly shifted upwards due to the lower mass.

10 shows the reference representation of a frequency spectrum of a single sinusoidal resonance frequency of a test structure which, like a racket according to the prior art, excites as a single resonance body, on a single fundamental wave (natural frequency), oscillates sinusoidally and in the line spectrum shown shows a clear formation of only a single one Shows fundamental wave ω, 96 and regular harmonic harmonics 2ω, - 5ω, 98.

11 shows the reference representation of a frequency spectrum for a test structure according to the invention with two resonance bodies. The spectrum shows a clear formation of additive and subtractive mixing frequencies between the fundamental waves ω, and ω ₂ 100, 102 of the test structure, which are frequency-shifted by multiple resonance, and their mixing frequencies ω ₂ -ω, and ω ₂ + ω ,. Accordingly, a racket according to the present invention does not have a single constant measurable natural frequency, but a plurality of variable frequencies, which, depending on the load on the structure, simultaneously form several apparent resonances of variable frequency and their mixed frequencies.

Claims

claims

1. Profilköφer for the production of a sports device, in particular tennis, squash, badminton, golf, hockey, ice hockey and baseball bats, with two parallel tubular resonance bodies (4,6,18,20), which are arranged at a distance from each other and are surrounded by a common envelope (12, 26) and a spacer (8, 22) which is arranged between the resonance bodies (4, 6, 18, 20),

characterized in that the mass of each resonance body (4,6,18,20) is greater than the mass of the spacer body (8,22) and the compressive strength of the spacer body (8,22) in the direction of a the center of the resonance body (4,6, 18.20) connecting axis (10.24) is largest.

2. Profilköφer for the production of a sports device according to claim 1, characterized in that the distance body (8.22) consists of wood or a wood-like material.

3. Profilköφer for the production of a sports device according to claim 2, characterized in that the distance body (8.22) consists of balsa wood.

4. Profilköφer for the production of a sports device according to one of claims 1 to 3, characterized in that the width (B ,, B ₂ ) of the resonance body (4,6,18,20) larger than the width (A) of the distance body (8th , 22).

5. Profilköφer for the production of a sports device according to one of claims 1 to 4, characterized in that the sheath (26) on the side (18 ", 20") of the resonance body (18,20), the opposite Resonanzköφer (20,18 ) facing away, has a greater wall thickness.

6. Profilköφer for the production of a sports device according to one of claims 1 to 5, characterized in that the sheath (26) in one or more layers of at least two plastic-impregnated surface materials (28, 30) are formed.

7. Profilköφer for producing a sports device according to claim 6, characterized in that the sheath (26) on the side (18 ", 20") of the resonance body (18, 20) facing away from the opposite resonance body (20, 18), each have first sections (26 ') which are connected via two second sections (26 "), the flat materials (30) of the first sections (26') with the flat materials (28) of the second sections (28) in the transition region (32 ) are arranged to overlap.

8. Profilköφer for the production of a sports device according to claim 7, characterized in that the surface materials (30) in the first sections (26 ') of the cover (26) thicker than the surface materials (28) in the second sections (26 ") of the cover (26) and / or that more sheet materials (30) are arranged in the first sections (26 ') than in the second sections (26 ").

9. Profilköφer for the production of a sports device according to one of claims 7 or 8, characterized in that the plastic-impregnated surface material (28,30) made of GRP, AFK, CFRP, KFK, MFK fiber plastic with a resin matrix or other layers, fabrics or Sheets made of metal or plastic that can absorb external forces.

10. Profilköφer for the production of a sports device according to one of claims 1 to 9, characterized in that in the distance body (8.22) and the sheath (12.26) laterally through recesses (14), in particular for the strings of a covering, are provided are.

11. Sports equipment, in particular tennis, squash, badminton, golf, hockey, ice hockey and baseball bats, which has a Profilköφer (2.16) according to any one of claims 1 to 10.

12. tennis racket with handle and frame according to claim 11, in which a

Frame and / or the profile body (2.16) forming the handle within at least one resonance body (18, 20) freely movable mass particles or liquid drops which dampen recoil forces and vibrations acting on the profile body, or alternatively one mass carrier tape or several mass carrier tapes (36) for kinetically effective, damping mass systems on the wall of at least one resonance body (18, 20).

13. Process for the production of a profile body for a sports device, in particular tennis, squash, badminton, golf, hockey, ice hockey and baseball bats, with the process steps

parallel arrangement of two tubular resonance bodies with the interposition of a spacer body, the spacer body being oriented such that the direction of the highest pressure resistance of the spacer body runs parallel to an axis connecting the centers of the resonance bodies,

Application of plastic-impregnated surface materials which only partially surround the resonance body and the spacer body, each individual surface material being arranged to overlap with another surface material only in the region of the side of the resonance body that faces away from the respectively opposite resonance body,

Placing in a mold (42) under the influence of heat,

Generating a mechanical pressure in the resonance body and laterally deforming the spacer body by means of a slide (48) and arranged in the mold (42)

Cure in the mold (42).

14. The method according to Anspmch 13, which further comprises the step of punctual, lateral and fiber-displacing piercing of the casing and the spacer after the lateral deformation of the spacer and before or during curing.

15. The method according to Anspmch 14, in which the casing and the spacer body are pierced in the form by means of a dome (50) from one side.

16. The method according to Anspmch 14, in which two domes (50, 52) are pushed from opposite sides through the casing into the spacer body until their end faces touch in the spacer body.